CVE-2026-33386 — XSS in QuickCMS

Description (CNA)

QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed. This issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.

Affected (CNA)

Vendor / product	Versions
OpenSolution / QuickCMS	affected 0 through 6.8

CWE

CWE-79

References

https://cert.pl/posts/2026/05/CVE-2026-33384/
https://opensolution.org/home.html

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.